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-rw-r--r--krebs/3modules/on-failure.nix91
1 files changed, 91 insertions, 0 deletions
diff --git a/krebs/3modules/on-failure.nix b/krebs/3modules/on-failure.nix
new file mode 100644
index 000000000..13d561b8d
--- /dev/null
+++ b/krebs/3modules/on-failure.nix
@@ -0,0 +1,91 @@
+{ config, lib, pkgs, ... }: with config.krebs.lib; let
+ out = {
+ options.krebs.on-failure = api;
+ config = lib.mkIf cfg.enable imp;
+ };
+
+ cfg = config.krebs.on-failure;
+
+ api = {
+ enable = mkEnableOption "krebs.on-failure" // {
+ default = cfg.plans != {};
+ };
+ plans = mkOption {
+ default = {};
+ type = let
+ inherit (config) krebs;
+ in types.attrsOf (types.submodule ({ config, ... }: {
+ options = {
+ enable = mkEnableOption "krebs.on-failure.${config.name}" // {
+ default = true;
+ };
+ journalctl = {
+ lines = mkOption {
+ type = types.int;
+ default = 100;
+ };
+ output = mkOption {
+ type = types.enum [
+ "cat"
+ "export"
+ "json"
+ "json-pretty"
+ "json-sse"
+ "short"
+ "short-iso"
+ "short-precise"
+ "verbose"
+ ];
+ default = "short-iso";
+ };
+ };
+ mailto = mkOption {
+ type = types.str;
+ default = krebs.build.user.mail;
+ description = "Mail address to send journal extract to.";
+ };
+ subject = mkOption {
+ type = types.str;
+ default = "[${krebs.build.host.name}] ${config.name} has failed";
+ };
+ name = mkOption {
+ type = types.str;
+ default = config._module.args.name;
+ description = "Name of the to-be-monitored service.";
+ };
+ };
+ }));
+ };
+ sendmail = mkOption {
+ type = types.str;
+ default = "/var/setuid-wrappers/sendmail";
+ };
+ };
+
+ imp = {
+ systemd.services = foldl (a: b: a // b) {} (map to-services enabled-plans);
+ };
+
+ enabled-plans = filter (getAttr "enable") (attrValues cfg.plans);
+
+ to-services = plan: {
+ "${plan.name}".unitConfig.OnFailure = "on-failure.${plan.name}.service";
+ "on-failure.${plan.name}".serviceConfig = rec {
+ ExecStart = start plan;
+ SyslogIdentifier = ExecStart.name;
+ Type = "oneshot";
+ };
+ };
+
+ start = plan: pkgs.writeDash "on-failure.${plan.name}" ''
+ { echo Subject: ${shell.escape plan.subject}
+ echo To: ${shell.escape plan.mailto}
+ echo
+ ${pkgs.systemd}/bin/journalctl \
+ --lines=${toString plan.journalctl.lines} \
+ --output=${plan.journalctl.output} \
+ --unit=${shell.escape plan.name}.service
+ } | ${shell.escape cfg.sendmail} -t
+ '';
+
+in out